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check out the tests in the latest mags. The ones that spring to mind are called something like "Salt and pepper" one been designed for the front the other the rear.
For proper mud, I'd vote for either Bonty Mud-X or Panaracer Trailrakers (known as Trailwreckers amongst the guys I ride with).
The narrower the tyre, the better it will cut through the mud to find something underneath to grip. Downside is a small contact patch so less grip in corners. Well, that's the theory I understand